Duarte climate — normals and trends
Duarte (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 15.5 °C and it receives 431 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (23.4 °C on average) and the coldest is January (8.9 °C). Rainfall peaks in February.
Duarte averages 7 frost days, 61 hot days (≥ 30 °C) and 45 rainy days per year.
Duarte has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.
The number of frost days there went from about 13 to 1 per year over the period.
The hottest day of the period reached 42.7 °C (on 6 September 2020) and the coldest -6.9 °C (on 22 December 1990).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
DuarteCalifornia
- coords
- 34.14°, -117.98°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.5°C
Average daily high
21.9°C
Average daily low
10.4°C
Annual rainfall
431mm
Sunshine / day
11.3h
Mean relative humidity
53%
Average peak wind
11.1km/h
Seasonal range
14.5°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
61 d/yr
Rainy days (≥ 1 mm)
45 d/yr
Annual snowfall
16.1 cm
Average feels-like high
20.7 °C
Average feels-like low
8.4 °C
Average peak gust
34.4 km/h
Tropical nights (≥ 20 °C)
15 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.57 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
42.7 °C
6 September 2020
Coldest day
-6.9 °C
22 December 1990
Wettest day
118 mm
9 January 2005
Windiest day
33.2 km/h
16 March 1964
Strongest gust
94.7 km/h
1 March 1983
Hottest feels-like
42.4 °C
6 September 2020
Coldest feels-like
-11.6 °C
22 December 1990
Snowiest day
17.7 cm
4 January 1974
Sunniest day
14.0 h
7 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 16.0 °C | +1.6 °C | 20 mm | -62 mm |
| Feb | 17.8 °C | +2.6 °C | 102 mm | +15 mm |
| Mar | 16.2 °C | -0.4 °C | 73 mm | +2 mm |
| Apr | 19.4 °C | -0.1 °C | 18 mm | -14 mm |
| May | 23.6 °C | +0.9 °C | 14 mm | +2 mm |
| Jun | 28.0 °C | +1.1 °C | 1 mm | -1 mm |
| Jul | 29.2 °C | -1.4 °C | 2 mm | -4 mm |
| Aug | 31.3 °C | +0.7 °C | 6 mm | -4 mm |
| Sep | 27.6 °C | -0.9 °C | 36 mm | +25 mm |
| Oct | 23.6 °C | -0.4 °C | 54 mm | +36 mm |
| Nov | 19.6 °C | +0.8 °C | 127 mm | +90 mm |
| Dec | 19.0 °C | +4.0 °C | 134 mm | +72 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Duarte?
Duarte has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 15.5 °C and it receives 431 mm of precipitation per year.
What is the hottest day ever recorded in Duarte?
The hottest day measured in Duarte between 1940 and 2025 was 6 September 2020, reaching 42.7 °C.
What is the coldest day in Duarte?
The coldest day measured in Duarte between 1940 and 2025 was 22 December 1990, at -6.9 °C.
Does it snow in Duarte?
Yes. Duarte gets on average 16.1 cm of snow per year and has around 7 frost days.
Has the climate of Duarte warmed?
Yes: Duarte warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Duarte?
The wettest day measured in Duarte between 1940 and 2025 was 9 January 2005, with 118 mm of rain in 24 hours.
What was the windiest day in Duarte?
The windiest day measured in Duarte between 1940 and 2025 was 16 March 1964, with winds reaching 33.2 km/h.
What is the warmest month in Duarte?
The warmest month in Duarte is July (23.4 °C on average); the coldest is January (8.9 °C).
How much does it rain in Duarte?
Duarte receives on average 431 mm of precipitation per year, spread over about 45 rainy days.
Is it sunny in Duarte?
Duarte gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
What is the biggest single-day snowfall in Duarte?
The heaviest 24-hour snowfall measured in Duarte between 1940 and 2025 was 4 January 1974, with 17.7 cm.
Are there tropical nights in Duarte?
Yes: Duarte has on average 15 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Duarte?
In Duarte, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 6 September 2020, and the lowest was -11.6 °C on 22 December 1990.
Compare Duarte with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Duarte